Scientific Linux Security Update : kernel on SL5.x i386/x86_64

This script is Copyright (C) 2013 Tenable Network Security, Inc.


Synopsis :

The remote Scientific Linux host is missing one or more security
updates.

Description :

- A flaw was found in the way the Linux kernel handled the
creation of temporary IPv6 addresses. If the IPv6
privacy extension was enabled
(/proc/sys/net/ipv6/conf/eth0/use_tempaddr is set to
'2'), an attacker on the local network could disable
IPv6 temporary address generation, leading to a
potential information disclosure. (CVE-2013-0343,
Moderate)

- An information leak flaw was found in the way Linux
kernel's device mapper subsystem, under certain
conditions, interpreted data written to snapshot block
devices. An attacker could use this flaw to read data
from disk blocks in free space, which are normally
inaccessible. (CVE-2013-4299, Moderate)

- An off-by-one flaw was found in the way the ANSI CPRNG
implementation in the Linux kernel processed non-block
size aligned requests. This could lead to random numbers
being generated with less bits of entropy than expected
when ANSI CPRNG was used. (CVE-2013-4345, Moderate)

- An information leak flaw was found in the way Xen
hypervisor emulated the OUTS instruction for 64-bit
paravirtualized guests. A privileged guest user could
use this flaw to leak hypervisor stack memory to the
guest. (CVE-2013-4368, Moderate)

This update also fixes the following bug :

- A bug in the GFS2 code prevented glock work queues from
freeing glock- related memory while the glock memory
shrinker repeatedly queued a large number of demote
requests, for example when performing a simultaneous
backup of several live GFS2 volumes with a large file
count. As a consequence, the glock work queues became
overloaded which resulted in a high CPU usage and the
GFS2 file systems being unresponsive for a significant
amount of time. A patch has been applied to alleviate
this problem by calling the yield() function after
scheduling a certain amount of tasks on the glock work
queues. The problem can now occur only with extremely
high work loads.

The system must be rebooted for this update to take effect.

See also :

http://www.nessus.org/u?50547e02

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 6.0
(CVSS2#AV:N/AC:M/Au:S/C:P/I:P/A:P)

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 70577 ()

Bugtraq ID:

CVE ID: CVE-2013-0343
CVE-2013-4299
CVE-2013-4345
CVE-2013-4368